Nice find. What's the price difference between this and their 5w30? Did they have 5qt jugs?

So as far as we know --> SN/A3-B4.

It's nice to see that along with the proliferation of 0w20, 5w40 is also increasing in availability by new brands. I'd feel more comfortable using this in the SFS Turbo since the manual allows for 5w40.

True indeed. The MB 229.5 standard is a rather strong standard being met. Even a fair amount tougher than A3B4. Which is saying something. This is possibly like Amalie Wolf's Head full synthetic oil. The other STP oil checked by PQIA had the exact same additive package as Amalie Wolf's Head. High molybdenum and boron.

What is interesting is there is no info on this oil on stp.com. Is this 5w40 made just for Autozone? The reason I ask, the front and back of the bottle say to recycle your used oil at your nearest participating Autozone!